Mixing apparatus



K. PFISTERER.

MIXING APPARATUS.

APPLICATION FILED OCT. 29. 1920.

untrue stares PATENT OFFICE.

KARL PFISTERER-{OF Z'lll'FIEE151HA'USEN', GERMANY.

MIXING APPARATUS.

Application filed October 29, 1920. Serial 110.. 420.547.

T 0 all whom it may concern Be it known that I, KARL .PFISTERER, a

' citizen of the German Republic, residing at cation of feed water for boilers, require very large receptacles if a uniform action shall be 7 obtained.

My invention relates to a mixing and saturating apparatus which, in consequence of its'novel construction and of its novel way of working, requires much less space, e. g, only one-sixth of the space required hitherto for an apparatus of the same efliciency and which further possesses the advantage that the solid substances are dissolved or suspended as completely as possible in the liquid.

This I obtain essentially through the novel application of a jet pump with a mixing nozzle which, being supplied with the mixing or dissolving liquid, feeds this liquid to the sieve box which contains the sub stances to' be dissolved or to be suspended, the particles descending in the mixing space being continuously driven up again until they are distributed in the liquid so finely that the dissolved particles are no longer influenced by the action of the jet pump and flow out through lateral outlets of the jet pump or of the mixing space into a clearing vessel which is constructed so that those particles which settle-in the same are once more subjected to the action of the jet pump.

In the accompanying drawing a device embodying my invention is shown by way of example, the apparatus being represented in a vertical axial section. I

The jet of liquid which is under a pres- *sure slightly above atmospheric, enters at a into a jet nozzle b.'Wl10S6 suctlon space is surrounded by a perforated wall 0. A jet 0 is placed above the nozzle 6; it terminates in the mixing nozzle 12 which is mounted coaxially ina vertical circulating tube is and extends with its upper end 7 into the proximity of a distribution sieve.

Specification of Letters Patent.

mama Jan. 24, 1922.

The part of the nozzle p which surrounds the jet pump 0 has perforations e. Borings (Z serve for establishing a communication between the tube 7c and the space between the nozzle 6 and sleeve '0.

A sieve box it, designed to serve as a receptacle for the substances to be dissolved, is arranged around the upper end of the mixing nozzle and located in a vessel 2' mounted on the upper end of the circulating tube 70.

All the parts described are mounted coaxially in a clearing vessel Z whose bottom is conical and narrower towards the perforated sleeve 0 which it surrounds. The outflow m of the clearing vessel is arranged as close to the upper end as-possible.

The operation of this apparatus is as follows a The jet of liquid entering at a passing through'the pump 0 and nozzle p, at a pressure slightly above atmospheric, strikes against the distributingsieve-g when comlng out of the orifice f of the mixing nozzle so that it loses its velocity and its direction of movement almost liquid is thus distributed over the sieve and divided into drops which trickle uniformly over the entire cross section of the sieve box it. In consequence of the breaking up of the liquid into small drops which filter through the substances enclosed in the sieve box it a very rapid dissolution or intimate mixing is obtained. The solution flows between the wall of the sieve box it and the funnel z' through the tube is to the lower part of the jet pump. Owing to the enlargement of the tube is at its lower end the solutlon is conducted over 'the outer wall of the nozzle which has perforations 6 so that it enters into the suction space of the nozzle 0 where the suspended coarse articles are. almost completely separated rom the liquid and instantaneously. The

returned to the liquid jet. The remainder of the solution flows through the boringsd into the suction space of the nozzle b in which the remaining suspended particles are through the outflow pipe m as en; absolutely clear, saturated solution or as a most intimate mixture.

A special remarkable feature of the improved apparatus is the absolute separation of the intense movement in the spaces which serve for mixing and distributing from the clearing or settling space in which the eifect of the jet apparatus makes itself felt only in a favorab e manner, that is to say in assisting the settling, a further remarkable feature being that accumulation of mud in the clearing vessel is absolutely avoided.

As shown in the drawing the distributing sieve g is preferably fixed to the lid of the apparatus, and the sieve box It is arranged so that it can be easily removed.

I claim Y 1. In a device of the kind described in combination, a central jet pump and mixing nozzle, a circulating tube surrounding said nozzle with a clearance, a vessel surrounding said circulating tube and communication tion between said jet pump and said lower I tending through and beyond said circulating tube into the said upper vessel, communication between said jet pump and said lower vessel and a filter partition within said lower vessel above said communication.

4. In a device of the kind described in combination, two superposed vessels, a circulating. tube connecting an opening in the bottom of the lower vessel with an opening in the bottom of the upper vessel, a jet nozzle in the bottom end of said circulating tube, a jet pump and tubular mixing nozzle above said jet nozzle, said mixing nozzle extendin through and beyond said circulating tu e into the said upper vessel, communication between said jet pump and said lower vessel and adistributing discabove the upper end of said circulating tube.

In testimony whereof I aflix my signature in presence of two witnesses.

KARL PFISTERER.

Witnesses:

'WILHEIM WINTER, EMILIE DEYLE. 

